I'm with Philp. This is 100% normal. I have the 1.2k pings to 8.8.8.8 almost constantly and it doesn't even register in the top 20 of things going through my firewall in terms of throughput. For what it's worth, I have a 100Mbps Internet connection at my site. The connection doesn't start to get saturated until the firewall is transferring over 10GB every 15 minutes as measured on my firewall (not Meraki MX). If 70MB is causing issues, you either have a really slow Internet connection, or you have other network issues.
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